Remove `time_column` from `TimeSeriesDataset`

[lars-reimann]

Is your feature request related to a problem?

The time_column is never used for training. Moreover, time series analysis also works without an explicit time column (e.g. one row per day) or with multiple time columns (e.g. hour/minute/second).

Desired solution

Remove the time_column from TimeSeriesDataset.

Possible alternatives (optional)

No response

Screenshots (optional)

No response

Additional Context (optional)

No response

[Gerhardsa0]

should this go in #767 or should I wait for review?

[lars-reimann]

I won't have time to review #767, unfortunately. So feel free to add this change there and coordinate with @sibre28 or @Marsmaennchen221 regarding the review.

[lars-reimann]

🎉 This issue has been resolved in version 0.27.0 🎉

The release is available on:

• v0.27.0
• GitHub release

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